Electromagnetic control device



June 1551926. I I 1588312 J. H. l- IANKEY g 3 ha J. H. HANKEYELECTROAGNETIC CONTROL DEVICE June 15 1926.

Filed Jan. 7. 1926 2 Shets-Sboet 2 INVENTOR. :ga 322 #cz 223% M dATTORNEY Patented June 15, 1926.

*UNITED STATES PATENT OFFICE.

JOHN H. EANKEY, OF HAGERSTOWN, MARYLAND, ASSIGNOR TO THE W. H. REISNERMFG. COMPANY, OF HAGERSTOWN, MARYLAND, A CORPORATION OF MARYLAND.

ELECTROMAGNETIC CONTROL DEVICE.

Application filed January My invention relatcs broadly toelectromagnetic control systems and more particularly to theConstruction of an electromagnetic control device.

One of the objects of my invention is to provide a Construction ofelectromagnetie control device in which the mechanieal force which maybe developed is relatively large for low power consumption for producingpull over a relatively short stroke with substantially no time lag.

Another object of my invention is to provide an electromagnetic controldeviee for the development of mechanical movement over relatively shortstrokes where the initial meehanical force is relatively large,gradually decreasing in proportion to the length of the stroke.

Still another object of my invention is to provide a magnetic control;device in which an electromagnetic system is provided having an arcuatepole face cooperating with an areuate armature member which is pivotallymounted on opposite sides of the electromagnetic system and forms aclosed magnetic circuit through the pole face, the shape of the armatureand pole face being such that a relatively large attractive force may bedeveloped at the beginning of the stroke, gradually decreasing inproportion to the length of the stroke.

A further object of my invention is to provide a Construction ofelectromagnetic control device in which a plurality of electromagnetsare provided, each being provided with an arcuate shaped pole facearranged to cooperate with an arcuate shaped armature which is pivotallymounted by members extending on opposite sides of the electromagnets andconnected with the core members of the magnets for providing a returnmagnetic path which has a minimum eircuitous path when the armature isattracted by the electromagnets to the limit of its path of travel.

A still further object of my invention is to provide means forprotecting the arcuate pole faces of an electromagnetic control devicefrom adherence with the movable armature of the control when thearmature is moved to a position where it overlaps the arcuate polefaces, reducing the circuitous magnetie circuit to a minimum.

Other and further objects of my invention will be understood from thefollowing 7, 1926. Serial NO. 79,905.

specification by reference to the accompanying drawings, wherein:

Figures 1 and 2 show the two extreme positions of my magnetic controldevice used in connection with an organ control system; Fig. 3 is across-sectional View taken through the magnetic control device; Fg. 4 isa cross-sectional view taken on line 4-4 of Fig. 3; and Fig. 5 is across-sectional View taken on line 5-5 of Fig. 3 showing the arrangementof parts of the magnetic control device.

In the drawings which illustrate the application of my magnetic controldevce to an organ control reference character 1 designates theelectromagnetic windings of the device which is mounted with respect tothe Console 2 by means of a magnetic plate 3 which is secured by screws3 to a block 4 in such position that normally the armature of themagnetic control device nay rest d- -rectly against the side of theconsole at 2 when the device is in unactuated position and be broughtinto a position substantially at an acute angle with respect to the sideof the console when the device is in actuated position. The magnet coresare designated at 5 Secured to the magnetic plate 3 with the heads 9 and10 secured thereto and provided with insulated tubular members 7thereover on which the magnet windings are disposed. The pole tips ofthe magnet cores 5 are arcuate in shape as represented at 6 in such adirection that a plane tangent to any part of the surface of the poletips 6 may intersect a plane which is aligned with the magnetic plate 3forming the base of the electromagnetic system. I provide a nonmagneticbushing or Copper ring 8 shaped to conform with the arcuate pole tips 6which embraces the pole tips and forms bumpers against which thearmature 18 of the electromagnetic control device may be moved. The rearplate 3 is provided with extensions 11 and 12 forming tongues at theouter extremities thereof between which the arms 14 and 16 of thearmature member are journaled at 15 and 17. The arms 14 and 16 are ofmagnetic material and form a path for magnetic lines from the magnetcbase plate 3 through the armature 18. The armature 18 is provided withangularly disposed cooperating faces 19 and 20 shaped in such mannerthat the armature may move to a position closely adjacent the magneticpole tips 6 at which time the armature face 19 entirely overlaps thearcuate pole tips 6 providing a minimum magnetic circuit for the linesof force through the magnetc system. shape is imparted to the armatureat ts face 20 such that a Contacting edge is presented for line abutmentwith the bushings 8 on the pole tips, The armature 18 has its arcuateface 19 extending over the pole tips 6 forming an extremely minute airgap be tween the pole tips 6. The power is taken ofi at a point ofconnection 21 with the armature 18. A link such as 22 may be connectedwith the' lug portion 21 to deliver a short reciprocating strolre to anydesired form of load. Tn Figs. 1 and 2 where the magnetic device isshown for the control of an organ, 'a bell crank lever 23-24 pivoted onframe member 28, is moved by the link 22 to actuate a slide 27 when theslide is in raised position by energization of the` circuit 32 ofsolenoids 26 at which time armature 25 lS brought into a position inwhich it engages the lower end of bell cranl 24 as represented in Fig.2. The slide 27 in its movement toward the right as represent-ed in Fig.2 engages spring member 30 actuating member 29 for Operating the organControls. 'The electromagnetic control in moving the slide 27 'serves tooperate the difi erent combinations designated by tablets on the frontof the Console electrically instead of pneumatically. It will beunderstood that there are a number of slides 27 according to thecapacity of the instrument and requirements of the console. A circuit 31is provided for 'controlling the windings 1 of the electromagneticdevice, circuit connections are taken to suitable circuit closingdevices and energy sources' for controlling any one of a number ofelectromagnetic devices constructed in accordance with my invention.

An clectromagnetic control device constructed in accordance with theprinciples of my invention herein has been found to operate with a highdegree of efficienoy. In one design of electromagnetic controldevicewhere the armature member 18 is initially spaeed th of an inch'from the pole tips 6, with a1:proximately 18 watts of energy, that is ata volt-ag'e of 25, and a current of .75 ampere, there has been developeda force of 24 pounds where the armature has a .8 inch stroke. Thepulling force continuously diminishes in proportion to the length of thestroke to a value of 8 po'unds at which time the anzularly disposed face20 of armature 18 abuts against the bumper or non-magnetic spacer ring8. The efficienoy of the magneti control device is due largely to thesimilar shapes which are imparted to the cooperating faces 6 of the polepieces 5 and face 19 of the armature 18. The air gap separating thearcuate pole tips 6 and the arcuate face 19 is extremely slight,enabling the magnetic means circuit to be readily completed through themagnetic base plate and the pivoted arms of magnetic material disposedbetween the magnetic base plate and the armature 18.

As heretofore pointed outthe electromagnetic control device of myinvention may be cmployed to perform a great many functions and T do notintend thatmy invention be limited to the use of the device inconnection with organe, but ti at many functions may be performed by thecontrol system. Modifications may be made in detail in the Constructionof 'the device without departing from the spirit of my intention and Tintend no limitations upon the invention other than those imposed by thescope of the appended claims.

What T claim and desire to secure by Letters Patent of the United Statesis as followsz- 1. An eiectromagnetic control device comprising incombination a base plate of magnetic material, a pair of core memberseX- tending from said base plate, electromagnetic windings disposed onsaid core members, each of said core members having arcuate shaped poletips at the extremities thereof, a pair of arms of magnetic materialpivotally mounted in said base plate on opposite sides of saidelectromagnetic windings, an armature carried by the extremities of saidarms and having a portion thereof eX- tending in an arc havingsubstantially the same radius as the radius of the pole 'tips of saidcore members, whereby said arma ture may be moved from a position remotefrom said pole tips to a position substantially overlapping` said poletips for establishing a magnetic circuitous path of minimum length whensaid electromagnetic windings are energized.

2. An. electromagnetic control device comprising in combination a pairof electromagnetic windings, core members positioned within saidwindings, a base plate connected adjacent the ends of said core members,said core members terminating in pole tips at the opposite ends thereofwhich are substantially arcuate in shape, a pair of arms of magneticmaterial mounted pivotally on said base member on opposite sides of saidelectromagnetic windings, an armature member interposed between oppositeendsv of said arms, said armature member having a portion thereof ofsetto form a limiting abutment with respect to the sides of said pole tips,with one face of said armature member shaped to correspond to the shapeof said pole tips whereby said armature may be moved from a positionremote from said poie tips to a position limited by the abutment of saidarmature with said pole tips, with one face of said armaturesubstantially overlapping said pole tips when said electromagnetcwindings are energized.

3. An electromagnetic control device comprising in combination a baseplate of magnetic material, a pair of core members secured thereto,electromagnetic windings positioned on said core members, said coremembers terminating in substantially arcu ate shape pole tips, a set oflateral extensions at opposite ends of said base plate, a pair of armsof magnetic material pivotally mounted in each of said sets of lateralextensions in a plane removed from the center line of said core members,an armature member carried between said arms and havin angularlydisposed faces cooperating with said pole tips, one of said facesforming a limiting abutment for the movement of said armature and theother of said faces being arranged to substantially overlap said arcuateshape pole tips when said eleetromagnetic windings are energized.

4. An electromagnetic control device comprising in combnation a baseplate of magnet-ic material, a pair of core members secured thereto,electromagnetic windings positioned on said core members, said coremembers terminating in substantially arcuate shaped pole tips,non-magnetic bushings surrounding each of said pole tips, a air ofnagnetic members pivotally mounte in said base plate on opposite sidesof said electromagnetic wndings, an armature member carried by theeXtremities of said magnetic members, said armature membering having apair of faces, one of which is disposed in arcuate formationcorresponding in shape to the shape of said pole tips and the other ofsaid faces presenting an abut-ting edge adapted to contact with thesides of said nonmagnetc bushings for limiting the overlappedrelationship of said armature with respect to said pole tips.

In testimony whereof I afiix my signature.

JOHN H. HANKEY.

